<?php

/**
* Title   : Aqua Resizer
* Description : Resizes WordPress images on the fly
* Version : 1.1.6
* Author  : Syamil MJ
* Author URI  : http://aquagraphite.com
* License : WTFPL - http://sam.zoy.org/wtfpl/
* Documentation : https://github.com/sy4mil/Aqua-Resizer/
*
* @param  string $url - (required) must be uploaded using wp media uploader
* @param  int $width - (required)
* @param  int $height - (optional)
* @param  bool $crop - (optional) default to soft crop
* @param  bool $single - (optional) returns an array if false
* @uses   wp_upload_dir()
* @uses   image_resize_dimensions() | image_resize()
* @uses   wp_get_image_editor()
*
* @return str|array
*/

function aq_resize( $url, $width, $height = null, $crop = null, $single = true ) {
  
  //validate inputs
  if(!$url OR !$width ) return false;
  
  //define upload path & dir
  $upload_info = wp_upload_dir();
  $upload_dir = $upload_info['basedir'];
  $upload_url = $upload_info['baseurl'];
  
  //check if $img_url is local
  if(strpos( $url, $upload_url ) === false) return false;
  
  //define path of image
  $rel_path = str_replace( $upload_url, '', $url);
  $img_path = $upload_dir . $rel_path;
  
  //check if img path exists, and is an image indeed
  if( !file_exists($img_path) OR !getimagesize($img_path) ) return false;
  
  //get image info
  $info = pathinfo($img_path);
  $ext = $info['extension'];
  list($orig_w,$orig_h) = getimagesize($img_path);
  
  //get image size after cropping
  $dims = image_resize_dimensions($orig_w, $orig_h, $width, $height, $crop);
  $dst_w = $dims[4];
  $dst_h = $dims[5];
  
  //use this to check if cropped image already exists, so we can return that instead
  $suffix = "{$dst_w}x{$dst_h}";
  $dst_rel_path = str_replace( '.'.$ext, '', $rel_path);
  $destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";
  
  if(!$dst_h) {
    //can't resize, so return original url
    $img_url = $url;
    $dst_w = $orig_w;
    $dst_h = $orig_h;
  }
  //else check if cache exists
  elseif(file_exists($destfilename) && getimagesize($destfilename)) {
    $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
  } 
  //else, we resize the image and return the new resized image url
  else {
    
    // Note: This pre-3.5 fallback check will edited out in subsequent version
    if(function_exists('wp_get_image_editor')) {
    
      $editor = wp_get_image_editor($img_path);
      
      if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
        return false;
      
      $resized_file = $editor->save();
      
      if(!is_wp_error($resized_file)) {
        $resized_rel_path = str_replace( $upload_dir, '', $resized_file['path']);
        $img_url = $upload_url . $resized_rel_path;
      } else {
        return false;
      }
      
    } else {
    
      $resized_img_path = image_resize( $img_path, $width, $height, $crop ); // Fallback foo
      if(!is_wp_error($resized_img_path)) {
        $resized_rel_path = str_replace( $upload_dir, '', $resized_img_path);
        $img_url = $upload_url . $resized_rel_path;
      } else {
        return false;
      }
    
    }
    
  }
  
  //return the output
  if($single) {
    //str return
    $image = $img_url;
  } else {
    //array return
    $image = array (
      0 => $img_url,
      1 => $dst_w,
      2 => $dst_h
    );
  }
  
  return $image;
}